3.1.9 Confirmation Messages

ResvConf messages are sent to (probabilistically) acknowledge
reservation requests. A ResvConf message is sent as the result
of the appearance of a RESV_CONFIRM object in a Resv message.

A ResvConf message is sent to the unicast address of a receiver
host; the address is obtained from the RESV_CONFIRM object.
However, a ResvConf message is forwarded to the receiver hop-
by-hop, to accommodate the hop-by-hop integrity check
mechanism.

The object order requirements are the same as those given
earlier for a Resv message, but the above order is recommended.

The RESV_CONFIRM object is a copy of that object in the Resv
message that triggered the confirmation. The ERROR_SPEC is
used only to carry the IP address of the originating node, in
the Error Node Address; the Error Code and Value are zero to
indicate a confirmation. The flow descriptor list specifies
the particular reservations that are being confirmed; it may be
a subset of flow descriptor list of the Resv that requested the
confirmation.